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Estimating evapotranspiration and determining crop coefficients of irrigated sweet potato (Ipomoea batatas) grown in a semi-arid climate

Author

Listed:
  • Mulovhedzi, N.E.
  • Araya, N.A.
  • Mengistu, M.G.
  • Fessehazion, M.K.
  • du Plooy, C.P.
  • Araya, H.T.
  • van der Laan, M.

Abstract

Accurate quantification of crop water use or evapotranspiration (ET) is crucial in agriculture for improved irrigation scheduling and water resource planning across a wide range of farming conditions. The aim of this study was to quantify ET dynamics for irrigated sweet potato (Ipomoea batatas) in order to determine the FAO-type single crop coefficients (Kc) that can be used in models to estimate crop water use under a wider range of semi-arid climatic conditions. An open-path eddy-covariance system containing energy balance sensors was installed in a 1.3 ha field to estimate ET of orange-fleshed sweet potato. The study was conducted during the 2014/15 and 2015/16 growing seasons. Daily ET varied between 0.5 and 5.5 mm (linked closely to canopy cover and weather conditions), with total seasonal measured ET of 361 and 347 mm for the 2014/15 and 2015/16 seasons, respectively. Time-averaged Kc values of 0.47 for the initial stage, 0.97 for the mid-season stage and 0.44 for the late growth stage were derived from this study. In addition, a heat unit based Growing Degree Days - Kc equation was successfully developed and validated in this study to adjust Kc values of sweet potato to specific climates. These Kc values can be used in combination with the FAO-56 reference evapotranspiration (ETo) to estimate site-specific sweet potato ET, which is vital for improving water management of irrigated sweet potato cropping systems growing under semi-arid conditions.

Suggested Citation

  • Mulovhedzi, N.E. & Araya, N.A. & Mengistu, M.G. & Fessehazion, M.K. & du Plooy, C.P. & Araya, H.T. & van der Laan, M., 2020. "Estimating evapotranspiration and determining crop coefficients of irrigated sweet potato (Ipomoea batatas) grown in a semi-arid climate," Agricultural Water Management, Elsevier, vol. 233(C).
    • Handle: RePEc:eee:agiwat:v:233:y:2020:i:c:s0378377419313411
    DOI: 10.1016/j.agwat.2020.106099
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    References listed on IDEAS

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    1. Richard Stirzaker & Ikenna Mbakwe & Nuru Ressa Mziray, 2017. "A soil water and solute learning system for small-scale irrigators in Africa," International Journal of Water Resources Development, Taylor & Francis Journals, vol. 33(5), pages 788-803, September.
    2. Nyathi, M.K. & Du Plooy, C.P. & Van Halsema, G.E. & Stomph, T.J. & Annandale, J.G. & Struik, P.C., 2019. "The dual-purpose use of orange-fleshed sweet potato (Ipomoea batatas var. Bophelo) for improved nutritional food security," Agricultural Water Management, Elsevier, vol. 217(C), pages 23-37.
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    Cited by:

    1. Li, Siping & Zhao, Lei & Sun, Ninghui & Liu, Qing & Li, Huan, 2021. "Photosynthesis product allocation and yield in sweetpotato with different irrigation levels at mid-season," Agricultural Water Management, Elsevier, vol. 246(C).
    2. Elbeltagi, Ahmed & Deng, Jinsong & Wang, Ke & Malik, Anurag & Maroufpoor, Saman, 2020. "Modeling long-term dynamics of crop evapotranspiration using deep learning in a semi-arid environment," Agricultural Water Management, Elsevier, vol. 241(C).
    3. Pereira, L.S. & Paredes, P. & López-Urrea, R. & Hunsaker, D.J. & Mota, M. & Mohammadi Shad, Z., 2021. "Standard single and basal crop coefficients for vegetable crops, an update of FAO56 crop water requirements approach," Agricultural Water Management, Elsevier, vol. 243(C).

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